2185605 has 24 divisors (see below), whose sum is σ = 4012632. Its totient is φ = 1096704.

The previous prime is 2185577. The next prime is 2185619. The reversal of 2185605 is 5065812.

It can be written as a sum of positive squares in 4 ways, for example, as 613089 + 1572516 = 783^2 + 1254^2 .

It is not a de Polignac number, because 2185605 - 2⁶ = 2185541 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 664 + ... + 2193.

It is an arithmetic number, because the mean of its divisors is an integer number (167193).

2^2185605 is an apocalyptic number.

It is an amenable number.

2185605 is a deficient number, since it is larger than the sum of its proper divisors (1827027).

2185605 is a wasteful number, since it uses less digits than its factorization.

2185605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885 (or 2882 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2185605 is about 1478.3791800482. The cubic root of 2185605 is about 129.7748568547.

The spelling of 2185605 in words is "two million, one hundred eighty-five thousand, six hundred five".